Which of the following terms refers to hair that grows on the scalp?

The correct term for hair that grows on the scalp is "capilli." This term specifically refers to the long, visible hair typically found on the head, distinguishing it from other types of hair on the body.

Cilia refers to short hair-like structures found on cells, primarily involved in movement or sensory functions, rather than the type of hair growing on humans. Barba refers to facial hair, particularly the beard, which is not related to scalp hair. Lanugo denotes fine, soft hair that covers the body of a fetus and is usually shed before birth; therefore, it also does not apply to the hair on the scalp. Understanding these definitions helps clarify why "capilli" is the correct choice in this context.